Description

The SC402B is a stand-alone synchronous EcoSpeed® buck power supply which incorporates Semtech’s advanced patented adaptive on-time control architecture. This provides excellent light-load efficiency and fast transient response. It features integrated power MOSFETs, a boot strap switch, and a programmable LDO in a 5x5mm package. The device is highly efficient and uses minimal PCB area. The SC402B has the same package and pin configuration as the entire SC40x series for compatibility.

Features

Power System

• Input voltage — 3V to 28V

• Bias voltage — 3V to 5.5V LDO or external

• Up to 96% peak efficiency

• Integrated bootstrap switch

• Programmable LDO output — 200mA

• Reference tolerance — 1% TJ= -40 to +125 °C

• Programmable soft start time

Logic Input/Output Control

• Independent EN controls for LDO and switcher

• Programmable VIN UVLO threshold

• Power good output

• Selectable PSAVE or FCM mode

Protection

• Over-voltage and under-voltage

• TC compensated RDS(ON) sensed current limit

• Thermal Shutdown

Output Capacitor Types

• High ESR — SP, POSCAP, OSCON

• Ceramic capacitors

Package

• Lead-free package — 5x5mm, 32-Pin MLPQ

• RoHS/WEEE compliant and Halogen free

Applications

Networking and telecommunication equipment

Printers, DSL, and STB applications

Embedded systems and power supply modules

Point of load power supplies